JP2001047176A - Double-acting die holder mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a double-acting die holder mechanism which is compact, simple in structure, durable and easy in double-acting forging at a low cost even by a compact single-acting press. SOLUTION: The double-acting die holder mechanism comprises an upper die holder 1 and a lower die holder which are arranged on a press opposite to each other, at least one of the upper and lower die holders 1, 2 comprises holder bodies 12, 22 to hold dies 14, 24, and holder bases 11, 21 mounted on the press, the holder bodies 12, 22 are mounted on the holder bases 11, 21 by providing a gap for the deflection of coned disc spring mechanisms 18, 28 via a plurality of sets of coned disc spring mechanisms 18, 28, and mandrels 17, 27 are allowed to advance into the dies 14, 15 after the upper and lower dies 14, 15 respectively held by the upper and lower die holders 1, 2 are brought into contact therewith.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-acting die holder mechanism, which has a compact and simple structure, is durable, and simplifies double-acting forging even with a small single-acting press. The present invention relates to a double-acting die holder mechanism that can be performed at low cost.

[0002]

2. Description of the Related Art Conventionally, when a material is formed into a complicated shape in one step by a press machine, double-acting forging is performed.

[0003] This double-acting forging is performed by using a double-acting press machine or by attaching auxiliary mechanisms such as a hydraulic double-acting built-in die holder mechanism and a link built-in die holder mechanism to a single-acting press machine. The subsequent second operation can be performed in one step.

[0004]

However, the double-acting press used in the above-described double-acting forging has a problem that the structure of the hydraulic device and its control mechanism is complicated, and the equipment cost is increased.

On the other hand, the method of mounting an auxiliary mechanism such as a hydraulic double-acting built-in die holder mechanism and a link built-in die holder mechanism on the single-acting press requires a large space for mounting the auxiliary mechanism. It cannot be applied to small press machines, and in particular, it is necessary to introduce a new large press machine with a large die height, which increases the equipment cost and has a problem in the durability of the auxiliary mechanism. .

The present invention has been made in view of the problems of the various apparatuses used in the conventional double-acting forging, and has a durable and small-sized single-acting press with a compact and simple structure. Another object of the present invention is to provide a double-acting die holder mechanism that enables simple and inexpensive double-acting forging.

[0007]

In order to achieve the above object, a double-acting die holder mechanism according to the present invention comprises an upper die holder and a lower die holder which are respectively disposed opposite to a press machine. At least one of the die holders is composed of a holder main body for holding a mold and a holder base attached to a press machine, and the holder main body is provided with a plurality of sets of spring mechanisms to form a gap that serves as a bending allowance of the spring mechanisms. After contacting the upper and lower dies held on the upper and lower die holders,
The mandrel is configured to enter the mold.

In the double-acting die holder mechanism, the holder body is attached to a holder base via a plurality of sets of spring mechanisms with a gap serving as a bending allowance for the spring mechanism, and upper and lower metal holders respectively held by upper and lower die holders. Since the mandrel is configured to enter the mold after contacting the mold,
Double-acting forging can be performed with a compact and simple mechanism. The required double-acting pressure and double-acting distance can be easily set by changing the elastic coefficient and the number of springs.

In this case, the spring mechanism can be constituted by concentrically stacking a plurality of disc springs by inserting them into a disc spring holder.

Thus, the double-acting operation of the die holder mechanism can be performed smoothly, and high-precision double-acting forging can be performed.

The spring mechanism is constituted by a plurality of coil springs, and is provided between the upper and lower holder bodies and the holder base.
Each of them can be configured to be held.

Thus, the required double-acting pressure and double-acting distance can be easily set using an inexpensive coil spring, and a durable mechanism can be provided.

Further, the spring mechanism can be symmetrically arranged around the mold.

Thus, the double-acting operation can be performed by making the double-acting pressure and the double-acting distance uniform, and high-precision double-acting forging can be performed.

A tapered pin having a tapered surface is vertically provided on the holder base through the holder body of the die holder, and the tapered surface of the die holder is opposed to the tapered surface of the tapered pin. The shaping pin for shaping the outer peripheral surface of the material by moving in the horizontal direction can be configured to be held by a pin holder fixed to the holder body.

Thus, a molded article having a complicated shape having a large diameter portion at the tip end can be molded with high precision.

Further, a synchronous mechanism for lowering the lower die holder in synchronization with the lowering of the upper die holder can be provided.

Thus, even when there is a difference in the molding resistance between the upper and lower molds during forging, the upper and lower die holders can be forcibly operated in synchronization with each other to perform uniform molding. The precision of the product can be maintained with high precision.

Also, a molded product releasing mechanism for forcibly releasing the molded product in the upper mold can be provided in the upper holder base.

Thus, the molded product in the upper mold can be surely
In addition, the mold can be forcibly released, and automation of forging can be smoothly performed.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a double-acting die holder mechanism according to the present invention will be described below with reference to the drawings.

1 to 3 show a first embodiment of a double-acting die holder mechanism according to the present invention. This double-acting die holder mechanism includes an upper die holder 1 that is directly mounted on an upper mounting base or a ram of a press machine, and a lower die holder 2 that is mounted on a lower mounting base. The upper die holder 1 and the lower die holder 2 are connected to the press machine. , Which are disposed so as to face each other up and down. A guide rod 29 projects upward from the lower die holder 2, and the guide rod 29 is inserted into a guide rod insertion hole 19 formed in the upper die holder 1 at the time of operation of the press machine, thereby forming the upper die holder 1. And the lower die holder 2 are aligned.

The upper die holder 1 is interposed between the upper holder base 11, an upper holder main body 12, and the upper holder base 11 and the upper holder main body 12, which are fixed to the upper mounting base or ram of the press machine via bolts 11B. The main part is constituted by the coned disk spring mechanism 18.

In this case, the upper holder body 12
A gap C is provided in the upper holder base 11 so as to be movable up and down by a predetermined distance in the vertical direction, and is attached via a bolt 13. The upper die 14 is disposed via a spacer 15 and an upper mandrel 17 is disposed at the center of the upper die 14 via a push-up spring 16. And
The upper mold 14 disposed in the mold insertion portion 14H via the spacer 15 is connected to the upper holder body 1 via the mold fixture 14B.
Fix it to 2. A spring insertion hole 17H is formed on the outer circumference of the flange 17F formed on the base end side of the upper mandrel 17 and formed on the spacer 15 of the upper mold 14 from the spring insertion hole 17H. Spring insertion hole 15H
The upper mandrel 17 is urged upward by arranging the push-up spring 16 so as to contact the upper surface of the upper mold 14 through the upper mold 14.

The disc spring mechanism 18 interposed between the upper holder base 11 and the upper holder body 12 is not particularly limited, but is symmetrical around the upper mold 14 fixed to the upper holder body 12. In this embodiment, four parts are provided. The disc spring mechanism 18 is formed by concentrically laminating a plurality of disc springs 18P by inserting the disc springs 18P into bolt springs 18G fixed to the upper holder base 11 via bolts 18B. The upper holder main body 12 is biased downward by disposing it in the disc spring mechanism insertion hole 18H formed in the upper holder main body 12.

On the other hand, the lower die holder 2 is
And basically the same configuration. That is, the lower die holder 2 includes a lower holder base 21 fixed to a lower mounting base (bolster) of the press machine via the bolt 21B, a lower holder main body 22, a lower holder base 21, and a lower holder main body 22.
And a disc spring mechanism 28 interposed therebetween.

In this case, the lower holder main body 22
A gap C is provided in the lower holder base 21 so as to be vertically movable by a predetermined distance, and is attached via a bolt 23. , A lower mold 24 is disposed via a spacer 25, and a lower mandrel 27 is disposed at the center of the lower mold 24 via a pressing spring 26. And
The lower mold 24 disposed in the mold insertion portion 24H via the spacer 25 is attached to the lower holder body 2 via the mold fixture 24B.
Fix it to 2. A spring insertion hole 27H is formed on the circumference at the outer peripheral portion of the flange 27F formed on the base end side of the lower mandrel 27, and the spring insertion hole 27H is formed in the spacer 25 of the lower mold 24 from the spring insertion hole 27H. Spring insertion hole 25H
The pressing mandrel 27 is urged downward by arranging the pressing spring 26 so as to abut the upper surface of the lower mold 24 through the lower mandrel 24.

The disc spring mechanism 28 interposed between the lower holder base 21 and the lower holder body 22 is not particularly limited, but is symmetrical around the lower mold 24 fixed to the lower holder body 22. In this embodiment, four parts are provided. The disc spring mechanism 28 is formed by concentrically laminating a plurality of disc springs 28P by fitting them into a disc spring holder 28G fixed to the lower holder base 21 via bolts 28B. The lower holder main body 22 is urged downward by being disposed in the disc spring mechanism insertion hole 28H formed in the lower holder main body 22.

Next, the operation of the double-acting die holder mechanism of the present invention will be described. The upper die holder 1 and the lower die holder 2 are mounted on the press machine so as to face each other up and down via bolts 11B and 21B. In this case, the upper die 14 and the lower die 24 and the upper mandrel 17 are provided in the upper die holder 1 and the lower die holder 2 respectively.
And the lower mandrel 27 is attached. Then, a material to be molded is set on the lower mold 24.

Next, by operating the press machine,
For example, when the upper die holder 1 is lowered together with the upper die 14, first, the upper die 14 and the lower die 24 attached to the upper die holder 1 and the lower die holder 2 come into contact with each other and are set on the lower die 24. Material is the upper mold 14 and the lower mold 2
4 and, if necessary, required forging is performed (left half view of FIG. 1 (first operation)).

Next, following the first operation, the upper mold 1
4 and the lower mold 24 are in contact with each other and the material is sandwiched between the upper mold 14 and the lower mold 24, and when the upper die holder 1 is further lowered together with the upper mold 14, the contacted upper mold 14 and The upper holder main body 12 and the lower holder main body 22 are pressed via the lower mold 24, and the disc springs 1 of the disc spring mechanisms 18 and 28 are pressed.
8P, 28P, the gap C between the upper holder base 11 and the upper holder body 12 of the upper die holder 1 and the lower holder base 21 and the lower holder body 2 of the lower die holder 2.
The upper holder body 12 moves relative to the upper holder base 11 and the lower holder body 22 moves downward relative to the lower holder base 21 so that the gap C between the two narrows.
As a result, the upper mandrel 17 and the lower mandrel 27 provided in the upper die holder 1 and the lower die holder 2 enter the upper mold 14 and the lower mold 24, respectively, and
A required forging process is performed on the material sandwiched between the lower mold 24 and the lower mold 24 (right half view of FIG. 1 (second operation)). The descending distance of the upper die holder 1 is a maximum, and the material is contacted by the upper die 14 and the lower die 24 before the upper die holder 1
The distance C between the upper holder base 11 and the upper holder main body 12 and the gap C between the lower die base 2 and the lower holder base 21 and the lower holder main body 22 are eliminated.

After the molding, when the upper die holder 1 is raised together with the upper die 14, the upper die 14 and the lower die 24 come into contact with each other.
With the molded product sandwiched between the upper mold 14 and the lower mold 24, the urging force of the disc springs 18P and 28P of the disc spring mechanisms 18 and 28 causes the upper die holder 1 to move between the upper holder base 11 and the upper holder main body 12. Gap C and the gap C between the lower holder base 21 and the lower holder body 22 of the lower die holder 2 are enlarged,
The upper holder body 12 moves relative to the upper holder base 11 downward, and the lower holder body 22 moves upward relative to the lower holder base 21.

When the upper die holder 1 is further raised together with the upper die 14, the contact between the upper die 14 and the lower die 24 is released, and the space between the upper die 14 and the lower die 24 is opened. The molded product can be taken out.

At this time, the upper mandrel 17 and the lower mandrel 27 are respectively connected to the lifting spring 16 and the pressing spring 2.
By the biasing force of 6, the molded product is separated from the molded product and returns to the initial position.

In this embodiment, both the upper die holder 1 and the lower die holder 2 are provided with the disc spring mechanisms 18, 28.
Although the upper mandrel 17 and the lower mandrel 27 are provided, depending on the shape of a molded product, these mechanisms may be provided only in one of the die holders, and only the mold may be provided in the other die holder. Can also be configured.

Next, modified examples of the double-acting die holder mechanism using the double-acting die holder mechanism are shown in FIGS.

This double-acting die holder mechanism can be used, for example, to form a molded article W having a complicated shape having a large-diameter portion Wa at its tip end, such as an automobile part (tripport / inboard joint) as shown in FIG. It is one that can be molded with high precision.

In order to reduce the size and weight of the tripod-in-board joint (hereinafter referred to as "molded product W"), the projecting length L1 of the large-diameter portion Wa at the distal end portion is formed short. There is a need. However, since such a molding cannot be performed by the conventional forging apparatus, as shown in FIG. 11, a straight protruding portion Wa ′ (protruding length L2> protruding) can be formed by forging. An intermediate molded product W ′ having a length L1) was molded and finished to a predetermined size in the next step.

Here, a molded article W having a complicated shape having a large-diameter portion Wa at the tip end as shown in FIG. 10 can be molded in one step and with high precision, and cost reduction can be achieved. A double-acting die holder mechanism capable of reducing the size and weight of components such as automobiles.

The double-acting die holder mechanism comprises an upper die 14 held by the upper holder body 12 of the upper die holder 1 and a lower die 2 held by the lower holder body 22 of the lower die holder 2.
In addition to 4, the upper die holder 1 is not particularly limited, and may be disposed on the lower die holder 2 side.
A taper pin 30 penetrating through the upper holder body 12 and vertically extending from the upper holder base 11, and the material W is pressed by the taper pin 30 and moves in the horizontal direction.
And a shaping pin 31 for shaping the outer peripheral surface of the
Pin holder 3 fixed to upper holder body 12 holding
3 is arranged. The tapered pin 30 and the shaping pin 31 are arranged in accordance with the shape of the molded product W. A set of tapered pins 30 and shaping pins 31 are provided.

In this case, similarly to the above embodiment, the upper mold 14 is provided with the mold fitting portion 1 formed on the upper holder body 12.
The lower mold 24 is attached to the lower holder base 21 via a spacer 25 in a mold fitting portion 24H formed in the main body 22.

As shown in FIG. 7, the tapered pin 30 has a screw hole 30h formed in an upper portion thereof, is fixed to the upper holder base 11 by being vertically attached with a mounting bolt 32, and penetrates the upper holder body 12. And the lower portion is formed on the tapered surface 30t facing the center.

As shown in FIG. 8, the shaping pin 31 is slidably held in a pin holder 33 in the horizontal direction.
4 and the lower mold 24, the base end is shaped by a tapered surface 31 t facing the tapered surface 30 t of the tapered pin 30, and the tip end is shaped by the tapered surface 30 t of the tapered pin 30. When the pin 31 is pressed and moves in the horizontal direction, the outer peripheral surface of the material W0 (the large-diameter portion W
(a leading end surface a) is formed into a predetermined shape, for example, a curved concave surface 31a so as to be formed into a curved surface.

The base end of the shaping pin 31 is slidably held in the horizontal direction so that the shaping pin 31 is held by the upper die holder 1 when the upper mold 14 and the lower mold 24 are separated from each other. The pin holder 33 is fixed to the lower surface of the upper holder main body 12 with bolts. As shown in FIG. 9, the pin holder 33 is formed so as to be separable into an annular main body 33a and a lid 33b, and the main body 33a has a hole into which the lower part of the tapered pin 30 having the tapered surface 30t is inserted. 33h
1 and a notch 33h2 into which the base end of the shaping pin 31 formed with the tapered surface 31t is inserted.
A notch 33h3 into which the base end of the shaping pin 31 having the tapered surface 31t is inserted is formed.

Thus, the taper surface 31t of the shaping pin 31 held by the pin holder 33 is opposed to the taper surface 30t of the taper pin 30 with a gap G, and the upper die holder is operated by operating the press machine. When the taper pin 30 is lowered together with 1, the taper surface 30t of the taper pin 30 and the taper surface 31t of the shaping pin 31 contact,
Thereby, the shaping pin 31 is pressed, and the shaping pin 3 is pressed.
1 is configured to move in the horizontal direction toward the center of the material W0.

Next, the operation of a modified example of the double-acting die holder mechanism using the double-acting die holder mechanism of this embodiment will be described.

As in the embodiment shown in FIGS. 1 to 3, the material to be molded is set on the lower mold 24. Next, when the upper die holder 1 is lowered together with the upper die 14 by operating the press machine, first, the upper die 14 and the lower die 24 attached to the upper die holder 1 and the lower die holder 2.
And the material set on the lower mold 24 is the upper mold 1
4 and the lower mold 24, and necessary forging is performed as necessary (the left half view of FIG. 4 (first operation)).

Next, following the first operation, the upper mold 1
4 and the lower mold 24 are in contact with each other and the material is sandwiched between the upper mold 14 and the lower mold 24, and when the upper die holder 1 is further lowered together with the upper mold 14, the contacted upper mold 14 and The upper holder main body 12 and the lower holder main body 22 are pressed via the lower mold 24, and the disc springs 1 of the disc spring mechanisms 18 and 28 are pressed.
8P, 28P, the gap C between the upper holder base 11 and the upper holder body 12 of the upper die holder 1 and the lower holder base 21 and the lower holder body 2 of the lower die holder 2.
The upper holder body 12 moves relative to the upper holder base 11 and the lower holder body 22 moves downward relative to the lower holder base 21 so that the gap C between the two narrows.
As a result, the upper mandrel 17 and the lower mandrel 27 provided in the upper die holder 1 and the lower die holder 2 enter the upper mold 14 and the lower mold 24, respectively, and
A required forging process is performed on the material held between the lower mold 24 and the lower mold 24 (the right half view of FIG. 4 (1 of the second operation)).

In this modification, the second
In accordance with the operation, the taper pin 30 together with the upper die holder 1 is used.
Descends, and the tapered surface 30t of the tapered pin 30 and the tapered surface 31t of the shaping pin 31 abut, whereby the shaping pin 31 is pressed, and the shaping pin 31 is moved horizontally in the material W.
Move towards the center of zero. When the shaping pin 31 moves in the horizontal direction toward the center of the material W, for example,
The distal end surface of the shaping pin 31 formed into the curved concave surface 31a is pressed against the outer peripheral surface of the raw material W0 (the distal end surface serving as the large-diameter portion Wa) to form the outer peripheral surface of the raw material W0 into a predetermined shape, for example, a curved surface. (The right half of FIG. 4 (second operation 2)). In order to prevent the lower end of the tapered pin 30 that has descended from coming into contact with the lower holder main body 22, depending on the length of the taper pin 30, the tapered pin 3
A recess 22h into which the lower end of the zero is inserted can be formed.

After the molding, when the upper die holder 1 is raised together with the upper die 14, the upper die 14 and the lower die 24 come into contact with each other.
With the molded product W sandwiched between the upper mold 14 and the lower mold 24, the upper holder base 11 and the upper holder body 12 of the upper die holder 1 are urged by the biasing forces of the disc springs 18P, 28P of the disc spring mechanisms 18, 28. The gap C between the lower holder base 21 and the lower holder main body 22 of the lower die holder 2 and the lower die holder 2 are enlarged,
The upper holder body 12 moves relative to the upper holder base 11 downward, and the lower holder body 22 moves upward relative to the lower holder base 21. In conjunction with the rise of the upper die holder 1, the taper pin 30 rises together with the upper die holder 1,
The tapered surface 30t of the tapered pin 30 and the tapered surface 31t of the shaping pin 31 are separated from each other, whereby the pressing of the shaping pin 31 is released.

When the upper die holder 1 is further raised together with the upper mold 14, the contact between the upper mold 14 and the lower mold 24 is released, and the space between the upper mold 14 and the lower mold 24 is opened. The molded article W can be taken out.

At this time, the upper mandrel 17 and the lower mandrel 27 are respectively connected to the lifting spring 16 and the pressing spring 2.
By the biasing force of 6, the molded product W is separated from the molded product W and returns to the initial position.

Since the base end of the shaping pin 31 is held by the upper holder main body 12 via the pin holder 33, even if the upper mold 14 and the lower mold 24 are separated from each other, the upper die holder 1 It rises while being held.

A return means may be provided on the shaping pin 31 so that the shaping pin 31 moves in the horizontal radial direction at the same time when the pressing force by the taper pin 30 is released, and returns to the initial position. .

Next, FIGS. 12 to 17 show a second embodiment of the double-acting die holder mechanism of the present invention. This embodiment employs a coil spring as a spring mechanism provided in the upper die holder 4 and the lower die holder 5 to be attached to the press machine. Other configurations and operations are the same as those of the first embodiment. Is the same as

In this case, as shown in FIGS. 12 and 14 to 17, the upper holder main body 42 of the upper die holder 4 has a mold fitting portion 44H for fitting a mold at the center of the lower surface.
Then, a large number of spring mechanism insertion holes 48H are formed symmetrically over substantially the entire upper surface corresponding to the periphery of the mold insertion portion 44H. The number of the spring mechanism insertion holes 48H is determined according to the load applied to the upper holder main body 42 during forging and according to the spring constant of the coil spring 8, and the load applied to the upper holder main body 42 is made uniform. Be available to The spring mechanism insertion hole 41H is formed at a position corresponding to the spring mechanism insertion hole 48H formed in the upper holder body 42 on the lower surface of the upper holder base 41 disposed above the upper holder body 42. The depths of the spring mechanism insertion hole 48H and the spring mechanism insertion hole 41H are set so that the coil spring 8 does not come off.

The alignment between the upper holder base 41 and the upper holder main body 42 which are vertically overlapped is performed by sliding the end surface of the upper holder base 41 on the guide plate G projecting upward at the end face position of the upper holder main body 42. As far as possible, it is inserted into the coil spring 8 inserted between the spring mechanism insertion hole 48H and the spring mechanism insertion hole 41H from the upper holder body 42 side, and screwed into the upper holder base 41. It is performed by the mounting bolt 4B to be locked.

The coil spring 8 is entirely or selectively inserted between the spring mechanism insertion hole 48H and the spring mechanism insertion hole 41H according to the load applied to the upper holder body 42 during forging. You can do so. In addition, the mounting bolt 4B can be omitted at a position where the synchronization mechanism 6 for setting the timing of the upper and lower die holders 4 and 5 described below is provided. Further, a sleeve S can be inserted into the mounting bolt 4B in order to protect the mounting bolt 4B and easily align the upper holder base 41 with the upper holder main body 42.

In this case, the upper holder body 42
A gap C is provided to the upper holder base 41 so as to be vertically movable by a predetermined distance.

On the other hand, the lower holder main body 52 of the lower die holder 5
As shown in FIGS. 13 and 14 to 17, a mold fitting portion 54 </ b> H for fitting a mold at the center of the upper surface, and substantially the entire lower surface corresponding to the periphery of the mold fitting portion 54 </ b> H. A number of spring mechanism insertion holes 58H are formed symmetrically. The number of the spring mechanism insertion holes 58H is determined according to the load applied to the lower holder main body 52 during forging and according to the spring constant of the coil spring 8, and the load applied to the lower holder main body 52 is made uniform. Be available to The spring mechanism insertion hole 51H is formed at a position corresponding to the spring mechanism insertion hole 58H formed in the lower holder body 52 on the upper surface of the lower holder base 51 disposed above the lower holder body 52. The depths of the spring mechanism insertion holes 58H and the spring mechanism insertion holes 51H are set so that the coil spring 8 does not come off.

The positioning of the lower holder base 51 and the lower holder main body 52, which are vertically stacked, is performed by sliding the end surface of the lower holder base 51 on a guide plate G projecting downward at the end surface position of the lower holder main body 52. As far as possible, it is inserted into the spring mechanism insertion hole 58H and the coil spring 8 inserted between the spring mechanism insertion hole 51H from the lower holder main body 52 side, and screwed into the lower holder base 51. It is performed by the mounting bolt 5B to be locked.

The coil spring 8 is entirely or selectively inserted between the spring mechanism insertion hole 58H and the spring mechanism insertion hole 51H according to the load applied to the upper holder body 52 during forging. You can do so. In addition, the mounting bolt 5B can be omitted at a position where the synchronization mechanism 6 for setting the timing of the upper and lower die holders 4 and 5 described later is provided. Further, a sleeve S can be inserted into the mounting bolt 5B in order to protect the mounting bolt 5B and easily align the lower holder base 51 with the lower holder main body 52.

In this case, the lower holder main body 52
A gap C is provided to the lower holder base 51 so as to be movable up and down by a predetermined distance in the vertical direction.

Next, the synchronous mechanism 6 shown in FIGS. 14 to 17 for lowering the lower holder main body 52 of the lower die holder 5 in synchronization with the lowering of the upper holder main body 42 of the upper die holder 4 will be described. . The synchronization mechanism 6 is fixed to the upper holder base 41 through a lever 62 swingably supported like a seesaw via a shaft 61 in the lower holder main body 52 of the lower die holder 5, and penetrates through the upper holder main body 42. Rod 63, which is disposed in such a manner as to face the lower end surface of the fixed rod 63 and abuts one end of a lever 62 inserted into the lower holder main body 52, and a lower holder base 51. The upper end is slidably inserted into and supported by a hole 5H formed in the lower holder main body 52, and the other end of the lever 62 is fitted into a recess 65a formed on the side surface. It is composed of a lever support 65 stopped.

This synchronization mechanism 6, as shown in FIG.
When the press machine operates, the upper holder main body 42 is moved from the state shown in FIG.
When it is lowered to the state shown in FIG.
The distal end of the fixed rod 63 fixed to the sliding rod 64 comes into contact with the sliding rod 64 and pushes down the sliding rod 64, whereby
The other end of the lever 62 has a lever support 65.
Since the shaft 61 is a fulcrum, it swings in a seesaw shape. At this time, the lever 62
The distance from the shaft 61, which is the fulcrum of the lever, to the contact position with the sliding rod 64, and the depression 65a of the lever support 65 from the shaft 61
And the other end of the lever 62 is provided with a recess 65a of the lever support 65.
, So that the lower holder main body 52 is moved by a distance of の of the pressing amount of the upper holder base 11.
Is pushed up, the upper holder base 41 and the upper holder body 4
2, the lower holder base 51 and the lower holder body 5
The gap C between the two is simultaneously reduced by the same amount. Thus, even when a difference occurs in the molding force between the upper and lower dies during forging due to mold wear, trouble of lubricating oil, etc., the upper and lower die holders 4 and 5 are forcibly operated in synchronization. The molding can be performed uniformly, and the precision of the molded product can be maintained with high precision.

Next, the molded product in the upper die 44 shown in FIGS. 14 to 16 is forcibly released from the mold so that the automation of the forging can be smoothly performed. The mold mechanism 7 will be described. The molded product release mechanism 7 includes a release main body 71 on the upper holder base 41 just above the upper die 44.
Is embedded and attached with bolts, the piston 72 is inserted into the cylinder formed in the demolding body 71 so as to push down the lockout of the upper mold, and a pressurized fluid such as hydraulic oil is inserted into the cylinder. Is configured to be supplied. In this case, the pressurized fluid is supplied in a timely manner when the upper die holder 4 rises from the bottom dead center, thereby forcibly releasing the molded product in the upper die 44. To Instead of supplying the pressurized fluid, the head side of the cylinder is closed and the gas is hermetically sealed. When the upper holder base is pushed down, the sealing gas on the cylinder head side is compressed by the piston and the upper die holder 4 is moved downward. It is also possible to adopt a structure in which the piston is pressed down by the compressed gas pressure when rising from the dead center, and the lockout of the upper mold is pressed down.

Note that the synchronization mechanism 6 and the molded product release mechanism 7
Are the first embodiment and its modified examples, and the following second embodiment.
The present invention can be applied to a modification of the embodiment.

Next, modified examples of the double-acting die holder mechanism utilizing this double-acting die holder mechanism are shown in FIGS.

This double-acting die holder mechanism is different from the double-acting die holder mechanism of the second embodiment in that, instead of the coil springs 8 all having the same diameter, two coils having different diameters are used in the inner and outer double systems. The coil spring 8 in which the spring is inserted concentrically is used, whereby the number of coil spring insertion holes can be reduced.

The other structure and operation of the double-acting die holder mechanism of this modification are the same as those of the double-acting die holder mechanism of the second embodiment.

[0071]

According to the double-acting die holder mechanism of the present invention, the holder body is attached to the holder base via a plurality of sets of spring mechanisms with a clearance as a bending allowance of the spring mechanisms, and is attached to the upper and lower die holders. Since the mandrel is inserted into the mold after the upper and lower molds held in contact with each other, the double-acting forging can be performed with a mechanism having a compact and simple structure. Also, by changing the elastic modulus and number of springs, the required double-acting pressure,
The double action distance can be easily set. This allows
A double-acting forging with a complicated shape can be easily and inexpensively performed with a small single-acting press having a small die height while having durability.

Further, by forming the spring mechanism by concentrically stacking a plurality of disc springs by fitting them into the disc spring holder, the double-acting operation of the die holder mechanism can be performed smoothly. High-precision double-acting forging can be performed.

The spring mechanism is constituted by a plurality of coil springs, and is provided between the upper and lower holder bodies and the holder base.
By configuring so as to hold each of them, the required double-acting pressure and double-acting distance can be easily set using an inexpensive coil spring, and a durable mechanism can be provided.

Further, by disposing the spring mechanism symmetrically around the mold, the double-acting operation can be performed with uniform double-acting pressure and double-acting distance. It can be carried out.

Further, a tapered pin having a tapered surface is vertically provided on the holder base so as to penetrate through the holder body of the die holder, and has a tapered surface facing the tapered surface of the tapered pin, and is pressed by the tapered surface of the tapered pin. A molded product that has a complicated shape with a large diameter portion at the tip by holding the shaping pin that forms the outer peripheral surface of the material by moving in the horizontal direction on the pin holder fixed to the holder body Can be molded with high precision.

Also, by providing a synchronous mechanism for lowering the lower die holder in synchronization with the lowering of the upper die holder, even if a difference occurs in the molding resistance between the upper and lower dies during forging, a forced force is provided. The upper and lower die holders can be operated synchronously to perform uniform molding, and the precision of the molded product can be maintained with high precision.

Further, by providing a molded product release mechanism for forcibly releasing the molded product in the upper mold in the upper holder base, the molded product in the upper mold is reliably and forcibly released. Molding can be performed, and automation of forging can be smoothly performed.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing a first embodiment of a double-acting die holder mechanism according to the present invention. After that, a state where it is further pressed is shown.

FIG. 2 is a plan view of the lower die holder (upper die holder).

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a front cross-sectional view showing a modified example of the double-acting die holder mechanism of the present invention. The state where it was further pressed is shown.

FIG. 5 is an explanatory view of an upper die holder, (A) is a plan view,
(B) is a sectional view, and (C) is a side view.

FIG. 6 is an explanatory view of a lower die holder, (A) is a plan view,
(B) is a sectional view, and (C) is a side view.

FIG. 7 is an explanatory view of a taper pin, (A) is a sectional view,
(B) is a bottom view, and (C) is a plan view.

FIG. 8 is an explanatory view of a shaping pin, (A) is a front view, and (B)
Is a left side view, and (C) is a right side view.

9A and 9B are explanatory views of a pin holder, wherein FIG. 9A is a plan view of a main body, FIG. 9B is a cross-sectional view of the main body, FIG.
(D) is a sectional view of the lid.

FIG. 10 is an explanatory view of a molded product, (A) is a front view, and (B)
Is a sectional view.

11A and 11B are explanatory views of an intermediate molded product W ′ molded by a conventional forging apparatus, wherein FIG. 11A is a front view and FIG. 11B is a sectional view.

FIG. 12 is a plan view of an upper die holder showing a second embodiment of the double-acting die holder mechanism of the present invention.

FIG. 13 is a plan view of the lower die holder.

FIG. 14 is a front sectional view of the upper and lower die holders during forging.

FIG. 15 is a front sectional view of the upper and lower die holders before forging.

FIG. 16 is a side sectional view of the upper and lower die holders before forging.

17A and 17B show a synchronization mechanism, wherein FIG. 17A is a front sectional view before forging and FIG. 17B is a front sectional view at the time of forging.

FIG. 18 is a plan view of an upper die holder showing a modification of the second embodiment of the double-acting die holder mechanism of the present invention.

FIG. 19 is a front sectional view of the same.

[Explanation of symbols]

 1 Upper Die Holder 11 Upper Holder Base 12 Upper Holder Body 13 Bolt 14 Upper Die 15 Spacer 16 Push-Up Spring 17 Mandrel 18 Disc Spring Mechanism 19 Guide Rod Insertion Hole 2 Lower Die Holder 21 Lower Holder Base 22 Lower Holder Body 23 Bolt 24 Lower Metal Mold 25 Spacer 26 Pressing spring 27 Lower mandrel 28 Disc spring mechanism 29 Guide rod 30 Taper pin 30t Tapered surface 31 Shaping pin 31t Tapered surface 33 Pin holder 4 Upper die holder 41 Upper holder base 42 Upper holder main body 44 Upper die 4B Mounting bolt 5 Lower Die holder 51 Lower holder base 52 Lower holder body 54 Lower mold 5B Mounting bolt 6 Synchronous mechanism 7 Mold release mechanism 8 Coil spring

Claims (7)

[Claims] 1. A holder body comprising: an upper die holder and a lower die holder, each of which is disposed to face a press machine, wherein at least one of the upper and lower die holders holds a die, and a holder for attaching the die to the press machine. The holder body is attached to the holder base via a plurality of sets of spring mechanisms, with a gap serving as a bending allowance for the spring mechanism, and the upper and lower molds respectively held by the upper and lower die holders are provided. A double-acting die holder mechanism, wherein the mandrel is configured to enter the mold later. 2. The double-acting die holder mechanism according to claim 1, wherein the spring mechanism is formed by concentrically stacking a plurality of disc springs by fitting them into a disc spring holder. 3. The double-acting die holder mechanism according to claim 1, wherein the spring mechanism is constituted by a plurality of coil springs and held between the upper and lower holder main bodies and the holder base. 4. The double-acting die holder mechanism according to claim 1, wherein the spring mechanism is symmetrically arranged around the mold. 5. A taper pin having a tapered surface penetrates a holder main body of a die holder, and has a tapered surface facing the tapered surface of the tapered pin, and is pressed by the tapered surface of the tapered pin. 5. The double-acting die holder mechanism according to claim 1, wherein a shaping pin for forming an outer peripheral surface of the material by moving in a horizontal direction is held by a pin holder fixed to the holder body. 6. The double-acting die holder mechanism according to claim 1, further comprising a synchronization mechanism for lowering the lower die holder in synchronization with the lowering of the upper die holder. 7. A molded product release mechanism for forcibly releasing a molded product in an upper mold is provided in the upper holder base. A double-acting die holder mechanism as described in the above.